I have used a caluclated Dimension in graphs. If i select particular dimension value in chart, Current selection shows all the dimensions used in calculation. For example
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if( IsNull(CloseDate)='-1', if(Code='amber_sla_breach' or Code='red_sla_breach' or Code='emergency_sla_breached' or Code='awaiting_parts_sla_breach' or Code='emergency_sla_breach' or Code='onsite_red_sla_breach' or Code='onsite_amber_sla_breach' , BreachType